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Fig. 1 | BMC Musculoskeletal Disorders

Fig. 1

From: Clinical predictors of surgical outcomes of severe carpal tunnel syndrome patients: utility of palmar stimulation in a nerve conduction study

Fig. 1

Nerve conduction study of carpal tunnel syndrome. (1) A motor nerve conduction study (MCS) was performed with a surface electrode on the abductor pollicis brevis (APB) and stimulation of the median nerve at the wrist and elbow. (2) A sensory nerve conduction study (SCS) was performed with a surface electrode on the second finger and stimulation of the median nerve at the wrist and elbow. (3) The compound muscle action potential (CMAP) was recorded with a surface electrode on the second lumbrical and the first palmar interosseous and stimulation of the median nerve and ulnar nerve. (4) The sensory nerve action potential (SNAP) was recorded with a surface electrode on the fourth finger and stimulation of the median nerve and ulnar nerve. (5) The CMAP was recorded with a surface electrode on the APB and stimulation of the median nerve at the wrist and the palmar region. (6) The SNAP was recorded with a surface electrode on the third finger and stimulation of the median nerve at the wrist and the palmar region. St Median: stimulation of the median nerve; St Ulnar: stimulation of the ulnar nerve

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